Abrasion resistant urethane coatings

Abstract

A radiation curable and abrasion resistant coating composition is provided comprising: (a) 70% to 98% by weight of an urethane-acrylate oligomer; (b) 2% to 30% of fine particles of a filler capable of imparting abrasion resistance having an average particle size in the range of 1-20 microns; (c) optionally a reactive diluent; and (d) optionally an synthetic resin. The coatings when applied to wood floorings impart superior abrasion resistance.

What is claimed is:  
     
       1. A radiation curable coating composition comprising: 
       (a) 70% to 98% by weight of an oligomer of the formula                    
       wherein R 1  is hydrogen or methyl; and Y is a divalent urethane residue;  
       (b) 2% to 30% by weight of fine particles of a filler blend capable of imparting abrasion resistance, said filler blend comprising a mixture of inorganic and organic particles, wherein said inorganic particles have an average particle size in the range of 1-20 microns and wherein said organic particles have an average particle size in the range of 1-20 microns;  
       (c) optionally a reactive diluent; and  
       (d) a synthetic resin which is a terpolymer of vinyl chloride, vinyl acetate and maleic acid.  
     
     
       2. A radiation curable coating composition comprising: 
       (a) 70% to 98% by weight of an oligomer of the formula                    
       wherein R 1  is hydrogen or methyl; and Y is a divalent urethane residue;  
       (b) 2% to 30% by weight of fine particles of a filler blend capable of imparting abrasion resistance, said filler blend comprising a mixture of inorganic and organic particles, wherein said inorganic particles have an average particle size in the range of 1-20 microns and wherein said organic particles have an average particle size in the range of 1-20 microns;  
       (c) optionally a reactive diluent; and  
       (d) a synthetic resin which is cellulose acetate butyrate.  
     
     
       3. A radiation curable coating composition comprising: 
       (a) 70% to 98% by weight of an oligomer of the formula                    
       wherein R 1  is hydrogen or methyl; and Y is a divalent urethane residue;  
       (b) 2% to 30% by weight of fine particles of a filler blend capable of imparting abrasion resistance, inorganic filler is alumina trihydrate having a particle size in the range of 3-5 microns and said organic filler is a blend of polytetrafluoroethylene and polyethylene having a particle size of 1-20 microns;  
       (c) optionally a reactive diluent; and  
       (d) optionally a synthetic resin.  
     
     
       4. A method of imparting abrasion resistance to wood floorings, which method comprises applying to said floorings a radiation curable coating composition comprising: 
       (a) 70% to 98% by weight of an oligomer of the formula                    
       wherein R 1  is hydrogen or methyl; and Y is a divalent urethane residue;  
       (b) 2% to 30% by weight of fine particles of a filler blend capable of imparting abrasion resistance, said filler blend comprising a mixture of inorganic and organic particles, wherein said inorganic filler is alumina trihydrate having a particle size in the range of 3-5 microns and said organic filler is a blend of polytetrafluoroethylene and polyethylene having a particle size of 1-20 microns;  
       (c) optionally a reactive diluent; and  
       (d) optionally a synthetic resin.  
     
     
       5. A method of imparting abrasion resistance to wood floorings, which method comprises applying to said floorings a radiation curable coating composition comprising: 
       a) 70% to 98% by weight of an oligomer of the formula                    
       wherein R 1  is hydrogen or methyl; and Y is a divalent urethane residue;  
       (b) 2% to 30% by weight of fine particles of a filler blend capable of imparting abrasion resistance, said filler blend comprising a mixture of inorganic and organic particles, wherein said inorganic particles have an average particle size in the range of 1-20 microns and wherein said organic particles have an average particle size in the range of 1-20 microns;  
       (c) optionally a reactive diluent; and  
       (d) additional synthetic resin which is cellulose acetate butyrate.